Machine for single-pass hide skiving

Abstract

The single-pass hide skiving machine includes a supporting structure (1) which rotatably supports a motorized cylinder (2). A first oscillating frame (3) rotatably supports a support cylinder (4) which is arrangeable in a working position below and slightly forward of the motorized cylinder. A second oscillating frame (8) rotatably supports a first bladed cylinder (9) which is arrangeable in a working position slightly rearward of the support cylinder. Arranged above and slightly forward of the motorized cylinder is a second bladed cylinder (31). Additionally, a contrast cylinder (18), kinematically connected to the support cylinder (4) by rollers (17), is movable into a working position between the support cylinder (4) and the second bladed cylinder (31). A hide is initially fed through the motorized cylinder and support cylinder and then through the first bladed cylinder (9) and the support cylinder (4) to effect the skiving. Selected skiving of the hide is possible by movement of the contrast cylinder (18) into its working position.

We claim: 
     
       1. Hide skiving machine, comprising a supporting structure with two supporting sides, a driving cylinder rotatably connected to said sides, a first frame and a second frame both coupled in an oscillating manner to said sides, said first frame rotatably supporting a support cylinder which is arrangeable upon an oscillation of said first frame in a working position which is slightly forward and below said driving cylinder, thereby a hide being advanceable between said driving cylinder and said support cylinder, said second frame rotatably supporting a first bladed cylinder which is arrangeable upon an oscillation of said second frame in a working position which is slightly rearward of said support cylinder, thereby a hide being skivable between said support cylinder and said first bladed cylinder, said hide skiving machine further comprising a second bladed rotating cylinder rigidly associated with said supporting structure in a preset frontward position above said driving cylinder, and a third frame being associated with said first frame in an oscillating manner, said third frame supporting a contrast cylinder which is kinematically connected to said first support cylinder by means of a row of rollers interposed therebetween, said contrast cylinder and said rollers being arrangeable in a working position between said second bladed rotating cylinder and said support cylinder upon an oscillation of said third frame, thereby a selected skiving of a hide being effected between said contrast cylinder and said second bladed rotating cylinder. 
     
     
       2. Machine according to claim 1, wherein said contrast cylinder is much smaller in diameter than said support cylinder and has a chromed rolling surface. 
     
     
       3. Machine according to claim 1, wherein said first oscillating frame is articulated to a lower axis which is arranged between said two sides and is actuated by a cam actuator between lowered position and a raised position so that said support cylinder presses a hide being processed against said driving cylinder, said first frame comprising, in an upper region thereof, a movable table for an insertion of a hide into the machine. 
     
     
       4. Machine according to claim 1, wherein said support cylinder has a chromed rolling surface. 
     
     
       5. Machine according to claim 1, wherein said support cylinder is rotationally coupled to an axis of rotation which is in turn rigidly rotationally associated with said first frame. 
     
     
       6. Machine according to claim 1, wherein said second oscillating frame is rotatable about a lower axis of rotation between a position in which said first bladed cylinder is spaced from said support cylinder and a position in which said bladed cylinder is close to said support cylinder by means of an actuation device, said first bladed cylinder being associated with a first sharpening assembly and a cylinder being arranged below said first bladed cylinder for separating a hide therefrom. 
     
     
       7. Machine according to claim 5, wherein said third frame comprises two opposite lever-like heads which are rigidly associated with said axis on which said support cylinder rotates, each head being associated in a downward position with a fluid-actuated cyclinder, said heads being joined by cross-members and having panels so as to form support planes for a hide frontward and rearward of said rollers. 
     
     
       8. Machine according to claim 1, wherein said contrast cylinder is motorized by means of said support cylinder and said rollers due to mutual contact, said contrast cylinder being guided between two parallel scraping edges. 
     
     
       9. Machine according to claim 1, wherein said rollers are free and covered with plastic material, each of said rollers rotating about a corresponding core, each core being separated from the adjacent ones by means of a spacer, said cores and said spacers being associated by means of jointed couplings so that the rollers can move orthogonally to the axis which joins them. 
     
     
       10. Machine according to claim 1, wherein said second rotating bladed cylinder is associated with a second sharpening assembly arranged above it. 
     
     
       11. Machine according to claim 1, wherein a rod is articulated to said second oscillating frame, extends upward, and supports a free roller for guiding a processed hide onto a lower unloading conveyor belt, said free roller being actuated by an actuator between a position in which the roller is below said first bladed cylinder and a position in which roller is adjacent to said support cylinder.